Daimler confirmed Friday that Li bought a 9.69-percent stake in the Stuttgart firm worth around 7.2 billion euros ($8.9 billion), making him its weightiest investor.

Industry analysts suggest having a new, more active major investor may irk executives at first, but could ultimately invigorate Daimler's transition towards more battery-electric and hybrid cars and internet-connected driving.

But worker representatives on Daimler's board said they too would scrutinise Li's plans, looking to defend factory sites and jobs in Germany.

"We expect of Li that he should have a long-term interest in Daimler and want to develop our company further, in cooperation with the workers," they said in a statement.

Some politicians see the investment in a broader context of Chinese cash winding around the sinews of the European economy.

The distrust is all the greater as EU nations are more open to investment from abroad than Beijing allows on its territory.

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